Flairforms pH Test Kit provides a simple, foolproof method of obtaining fast and accurate pH readings. With NO complex or costly maintenance between tests you'll appreciate why many growers with electronic pH meters resist checking pH. When using a pH Test Kit you will get accurate results every time. Since pH is a measure of the concentration of hydrogen ions, it is important that any pH test method only responds to those ions. Flairforms pH Test Kit however cannot give false readings because it will only respond to hydrogen ions. Benefits: * Super concentrated - 1 drop per test. Each 30ml bottle provides over 800 tests. * Measures from pH 4.0 through to 8.0: This is a very important feature because some pH testers do not operate below pH 6 (i.e. show the same color over 4 to 6) and therefore if your nutrient pH is well below 6, a test will still show 6. * Highly accurate, waterproof color chart on side of bottle. * Long shelf life. * Perfect back-up for die-hard pH meter users. * Supplied with a quality test tube.